Saw-gummer



(NoModeL) .H.IHSEN.

SAW GUMMER. No. 324,028. Patented Aug 11, 1885.-

UNITED STATES PATENT OFFICE.

HENRY IHSEN, OF ALLEGHENY CITY, PENNSYLVANIA.

SAW-GUMMER.

SPECIFICATION forming part of Letters Patent NO. 324,028, dated August 11, 1885.

(No model.)

To all whom. it may concern:

Be it known that I, HENRY IHSEN, of Allegheny City, in the county of Allegheny and State of Pennsylvania, have invented new and useulf Improvements in Saw-Gummers; and I do hereby declare thefollowing to be a full, clear, and exact description thereof.

My invention relates to apparatus employed for gumming or cutting a throat in the teeth of saws, generally termed a saw-gummer, and relates specially to that class of saw-gummers which clamp or otherwise are secured to the saw, and cut a throat or gullet by means of a burr or milling tool mounted on an arbor or shaft journaled to the machine.

It consists, essentially, in a saw-gummer composed of a gunimer-frame arranged to be attached to the saw and having two stationary arms or bearings, a sliding cutterearriage, a rack bar, a feeding wheel, and pinion, the rack bar being made fast to the upright of the sliding cutter-carriage, and a coiled spring that is interposed upon the rack-bar between the upright on the sliding carriage and the inner upright of the stationary frame, the cutter-carriage being advanced or quicklywithdrawn bythe feed-Wheel, pinion, and rack-bar in gumming the saw or withdrawing the cutter.

It also consists in certain improvements in holding the carriage against the pressure of the springwhen the cutter is withdrawn, and, finally, in the means for adjusting the frame to the proper angle at which it is desired to feed tl1e cutter.

In the drawings, Figure 1 is a top view of my improved gummer; Fig. 2, a longitudinal section showing aportion of the saw in dotted lines to illustrate its operation; and Fig. 3 is a side View of the tail-clamp.

A is the gummer-frame, and is provided with the clampingarms b,-through athreaded hole in one of which the clamping-screw b passes, and by means of which the forward part of the gummer is secured to the saw. At the back of the frame is the tail d, to which the slotted tail-support e is adj ust-ably secured by means of the slot and the screw and the thumb-nut d. The tail-support is slotted its entire length, and to its lower end, shown in the position at which the gummer is set, is secured the tail-clamp c. It consists of a slotted block,.one leg of which is adjustably secured to the tail-support by a screw and thumb-nut, c, and the other leg is provided .with a clampingscrew, 6, for securing the ming the saw, as hereinafter described. At

the end of the cutter-carriage are the bearings k, in which the shaft or arbor l, carrying the cutter m, is journaled. usual or approved construction.

At the rear of the frame A are the stationary arms a a, which are usually cast with the frame, which has rectangular openings n, of sufficient size to pass the pinion m through them, and similar vopen'ingsm, above them for retaining and guiding the rack-bar p, thelower end of the rack-bar being secured to the cutter-carriage.

Between the arms a a are journals 0 o for supporting the shaft q, upon which is mounted the pinion m for reciprocating the rack-bar. To the end of the shaft is attached hand-wheel g, by the movement of which the cutter is advanced or retracted. Between the upright on the carriage, and the stationary uprightaon the frame, and surrounding the rack-bar, is placed a spring, 8, which is of sufficient strength to feed the cutter. Upon the outer end of the rack-bar is an adjustable collar, 1". By its adjustment the depth of the cut isgaged, the collar coming in contact with the stationary upright a of the frame.

When shifting the gummer to set it to cut the next tooth, the cutter should be retracted and held against the action of the spring un-' til the gummer is clampedin position. This I accomplish by a pivoted catch, it, secured to the frame A,which upon being moved in the proper direction will engage with one of the teeth of the pinion.

The operation of the gummer is as follows: Before placing the gummer upon the saw, by turning the hand-wheel the cutter-carriageis drawn back as far as the spring will allow it. The pivoted catch is then moved to engage with These parts are of the a tooth 011 the pinion, which prevents the retraction of the carriage. The gummer is then placed upon the saw, the cutter resting on the back of the tooth that is to be gunnned, and by means of adjustable tail-support and adjustable tail-clamp, the gummer is set at the angle the cut is to be made. The clamping-screws b, c, d, and c are then tightened up, and the glimmer thus firmly secured 011 the saw. The catch tis then moved, whereby the carriage is permitted to move forward with the cutter by the action of the spring. Should itbe desirable, thehand-wheel could be operated to feed the cutter. The cutterm is then rotated by means of the crank 12 on the arbor Z, and the spring slowly feeds the cutter forward, or the handwheel may be turned to perform the same function.

T0 move the gummer to the next tooth, the carriage is drawn back by means of the hand- W eel. To retract the spring, the catch is made engagewith the pinion,and the clamp-screws e are loosened and the gummer lifted off, and, without altering the adjustment, placed upon the saw so that the cutter rests against the back of the next tooth to be gunnned, and the operation is repeated, each tooth being thus gunnned at the same angle and the same depth.

I am aware of a saw-gumlner that feeds the cutter by means of a rack and pinion, but do not know of one in which the cutter is fed by a spring and retracted by a rack and pinion; and I am also aware of a gummer whose support for the tail-piece has but one adjustment,

and whose tailclamp has but one adjustment independent of the tail-piece support, but I am not aware of a tail-piece support which can be adjusted radially and vertically with relation to the tail-piece, nor whose tail clamp has a similar adjustment.

What I claim is- 1. In a saw-gummer, the combination of the frame with the carriage, the rack-bar, the spring, and the pinion, substantially as shown and described.

2. In a saw-glimmer, the combination of the frame with the carriage, the rack-bar, the pinion, the spring, and adjustable collar on the bar, substantially as shown and described.

3. In a saw-gummer, the combination of the frame with the carriage, the rack-bar, the pinion, the spring, and the catch, substantially as shown and described.

4. In a saw-glimmer, the combination of the frame with the slotted support for the tailpiece, the tail-clamp, and their clamping-nuts and screws, whereby the supporting-piece may be adjusted at either end, substantially as shown and described.

5. In a saw-glimmer, the combination of the frame with the cutter-carriage, the rack-bar, the pinion, the spring, the slotted support for the tail-piece, the tail-clamp, and their clamping nuts and screws, substantially as shown and described.

HENRY Il-ISEN.

IVitnesses:

CONRAD Il-ISEN, WM. EHRENSING. 

